Arrange 6 tortillas over the bottom and sides of a 9x13-inch baking
pan, overlapping as needed. Top with half of the ground beef mixture
and spread to cover the tortillas evenly. Spoon the cheese mixture
over meat and spread to cover meat evenly. Arrange the remaining
tortillas over cheese and top with remaining meat mixture.

Bake, uncovered, for 30 minutes. Remove from oven and top with
shredded cheese. Return to the oven for 10 to 15 minutes or until
melted as desired.